Abstract

(Abstract only. Link to:http://newprairiepress.org/kaesrr/vol1/iss3/6/) Article is nearly identical to
Long-Term Nitrogen and Phosphorus Fertilization of Irrigated Grain Sorghum, previously published in Kansas Fertilizer Research 2015, included in this PDF.

Long-term research shows that phosphorus (P) and nitrogen (N) fertilizer must be applied to optimize production of irrigated grain sorghum in western Kansas. In 2014, N applied alone increased yields 49 bu/a, whereas N and P applied together increased yields up to 81 bu/a. Averaged across the past 10 years, N and P fertilization increased sorghum yields up to 73 bu/a. Application of 40 lb/a N (with P) was sufficient to produce more than 80% of maximum yield in 2014, which almost equals the 10-year average. Application of potassium (K) has had no effect on sorghum yield throughout the study period.

Keywords: soil fertility, irrigation, grain sorghum, nitrogen fertilization, phosphorus fertilization

How to Cite:

Schlegel, A. & Bond, H. D., (2015) “Nitrogen and Phosphorus Fertilization of Irrigated Grain Sorghum”, Kansas Agricultural Experiment Station Research Reports 1(5). doi: https://doi.org/10.4148/2378-5977.1076